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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2672707b8be8350b0d20d71bb2608a4940811b4bbb5236c27f1f9cfb59c7f52' 
  AND token = 'ARU/cWu8oHb2U4W5jc9SUMIt9kXLKoujyvhxR0sanSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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