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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0922814e312caac8d2040e80f3e1cd1614c92f076c9bc64122a037ecbd1ca20d' 
  AND token = 'iRrZvJ2fw4aH3giZ/N28g28bP4dt+oHy8xjLxPQWOhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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