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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7963c19ab8acddd1a51f0d7b266c6d140e2f11d76fae532203811c87aca7113d' 
  AND token = '9q5+kp+D3Hqwm6DoBOd5gH0IEeCP7VsVXf8qeLTkJxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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