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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec053b417d4900cf6de45cf29c7aafebf0ff86f4148981c7b534beb6d525fa3' 
  AND token = '51gQ09kUM3MqU1EWwmCfOxAwrkSScfM4xqpEs4SSBgw=' 
  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"
    }
  }
}