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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b46b0d64055e64041969ec626f487116d83c9c25c3d90a1c44dc939fbb9353d' 
  AND token = '5tB9ztLXdIr5s4/5AuATeLMOxnDQXGuxOP2xZxg45z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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