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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2916ec0d9cf0fbead543bd125725ca64eca7e0fbf35f515ec3b23f4b118091d0' 
  AND token = 'H1HRn6dGI7qLtXqbGWaHJIXBj5YKDa1eJ/ts+B+jWCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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