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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f804f936c6b85c9de413bee8629a65def4d92dd0511dafb95bf3ef2680585ac' 
  AND token = 'wkpvmq8vSyM/U+Gccui/w5JylSMZ66QJd3DF9T6BLtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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