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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6898b5ec15bee98f1c1d46b02d91411a51be0f35d33f44d52ddf8b984c6d549e' 
  AND token = 'txLU7ypLhTrlO6ZS0rjJxR1OI6R5OCDXxyT/LuRaHpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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