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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682d47c9d3ca695703bc9e7247f21ee332eb8d7a23b1979d5a4fadb73e94e9c4' 
  AND token = 'AQbXYXbITYE9EyCpWxk0nFm5aanXjPdR5PqGoRVOFIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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