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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02c1de7565291c1a8bf860435a6a77fdd2d0a371393d493a3c71f36fc276099' 
  AND token = '7cXX1S0JeYP17uaUWaz45zwQDBSMgSypvrheGMlsj6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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