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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a002c2d10f12e8f37417dee9e98be3bc8b1f48030f65c886a446cbc96772ad3d' 
  AND token = 'q63oRKtGEcMb4oW9JtrCm2/PsvgCdJ8p2ZUpL8QGuPc=' 
  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"
    }
  }
}