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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3317bfc592eaaf5076a5340d64da8db2b7a00338ce92eb0bcdca7cff6c7de8' 
  AND token = 'kloXwA3Cz9tRiEgA4CqkdAZ5vVEuy6DKcCm6T0FYVhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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