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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57199638d83b902c616d8e4642e4cd4e9a9b1975494c0223569987b3f61a3d54' 
  AND token = 'L36M5Dl3ARL5Pp8Xrv6zJwrbJ8lD2VNgoD3LyAOGIeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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