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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530976cef982dfbf9d12a70bab7b92e3cc48752fd7ca1931da4d4c339666fc68' 
  AND token = 'vbuHeHwo6YApl+8abIfpf+fU2I51aDzM+ja1ZGUkkY4=' 
  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"
    }
  }
}