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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae63df52744df46dfb7e2333c145690804a009db39f03667938e9525ed7bb0f' 
  AND token = 'SZQZipU6dK5k4abQeoIJNmQu6fV0qImLre4+o/LF8r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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