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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7355b4a6c04c8323d1b65e17dae7418abb34383a9f300cdb35f893234650212c' 
  AND token = '4p21Ki0Uc4rBWpKTybXp2Fk+8IeSYy541Z9SMf30r30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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