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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee002932e768614654c87fe403361b7e8d2c5c2d4c5404da76e2b0c1cba7aefa' 
  AND token = 'D4gj6XHBvkCNk/nxWNJf8hm+KVV2jyRUDdDfUlGTe48=' 
  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"
    }
  }
}