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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a97764eaab9cbc062e553164a0b04a8ce3ba171645928145802c6b4bce056e4' 
  AND token = 'YK12wZLt8FnqEklrf4l4zvnrwn4UNtKikv/vC5Qx9t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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