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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e93f9f50c583f0f3d49deef319efcaf49922bbdc7d3e6ee4eecfdb475f5da3' 
  AND token = '77IYlm/1XthKF0b3UYnuJoL7mta7NHs9Vwlku8DzlJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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