SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10925294a25cc7a5fb33a9bbffbc1f2ce9f2a717347dbe1b68158eef5a79aab5' 
  AND token = 'NPOjvsGlKdT/5H1FM7tMBpvEezz/A9rK6DUR4qXZXXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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