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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cbe1b42e7ae1b6e09f5446203cdf5294d0501b909eb8e83e76160fa25a95fb' 
  AND token = 'TJiUx7sOTX5YLNMhV1ZrFudkO7Iw6jmEmQWTRP1owHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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