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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864ba6f9ec8811f7b2f19a2f07e8df9c897f888592b2ff35d18f721ec126385b' 
  AND token = '2FtgpUb5zCSTTBstWgAJSZsP1XOXKCc640Xfl+w78ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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