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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f18e7963e26e4591ff1795dbd531ed8218c2f0e99b1c87c4cec0e94540aa4f' 
  AND token = 'qvm+hG4zYubyMUaQr8ydbnVcUyteu2k8c6e6nKq3U34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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