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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4def75f76d2f191a0be80a8f75b86797020b457b5c7b2eb8e360e70e5e99a3c4' 
  AND token = '3PoI9UNf0MGfSEr0dWvEpmxUXyNw63aoyqEsGeubFnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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