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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d1ad4b0cce9b42e979696ce2fc84dee63a1603e34bbe9d10ae1aa16414d1a2' 
  AND token = 'oWnhWvLTQxtJHLcbrijNAO3N59orjYsHC15dh5ioJ80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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