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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90a09bceead58e3b39146fd842f20a6c3bf79be2f93d6e5c8f89551bdc95cff' 
  AND token = '895qWZTZVfVIECMv4sbUAJ77UO/u8RsIiymqJayHZU4=' 
  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"
    }
  }
}