SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dba3d842b48bcdc9f1dfe6d55591751f745a7d364052c5764769a6893ce716b' 
  AND token = 'nzGS3Byu4a9ILCBjY/D8nCA0vavh6g3KRJRoMyJzlw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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