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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f35c52c708f1f7aa09747abee3bf3733d7dc7d7adf3f7ca83571078c482484' 
  AND token = '1LLeR0zylZK3S+xrIn0nyfoCnjpNueJOeprLU82ir3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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