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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc3c94148ec210cfb2d3339e2f5fde43a6520aca006ee0885a9ceb8f37fb0be' 
  AND token = 'ljpoGnPz+UJMHH3Q9UyiSkVpteO8kMhdRNKMPfgX8z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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