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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753622edd5e4406bf912096008a9e8d4028cf04fd05f2f30a8e370d5ff39407d' 
  AND token = '8x6Oqh8qR3H9Mh/TUb7gaRdOvqorcyfTPKtRgrJVL98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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