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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182e298b5ff8a7462fe31b8f5ffff1efab9370ecf5928fa80ee2ba88daed491b' 
  AND token = 'enm8habcSzd2j8H2qy+W3xqrlSx9CGhe3knprAv65MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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