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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b6755c7dea0c1e81cf79a18eff3c3a3de66e5106009d842805236d6d9ae4ca' 
  AND token = 'vMlzSs578TCjRwe198yPFZuDw51ccB6Vlve1OCTEF+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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