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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f19229d9bda2c29773a21596361da3f9f1226da44d6637ee7f80dbc546f01fd' 
  AND token = 'ocgWS/1iAuh1mPPvZ5ntfY7jA59S2IKWOVpqySGrcR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}