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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e98a7ccd97d653b547b659634ebafc293e7abd82c9fde084c3cabd4d4aa19a9' 
  AND token = '4sGUY1EIqWQQ2YY0aLTx/zpIRFRt6fc0bpc1JeqM2bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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