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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3ad13130e8b0a502cfe237f5e474d56877ba9a02d18b03d3ba05a02ce53869' 
  AND token = 'koPbvQIewAZsjtKT5Mr+o3Zd6cfPl96yZMQOJ84G0OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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