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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecc8e6fcfb969f35cd9c5dc828f878e28c3e75ff001f2fd76b2272e8de44fbb' 
  AND token = 'XaT2/RdbWoTDQ9Zohb/I1sI4wtWvfNKx78wm6ZHEg6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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