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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f18fbe57e43bf81c0bf5f4420d779b94378960101df99cb59062582f49d3ef' 
  AND token = 'OYlA3rOUZXQxPtu7M/2tHJKiS7L+f1Axksvib+zMUOo=' 
  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"
    }
  }
}