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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea141bccb97b4f506c482513c737aadd17d71ca0b091526e99291410c5c6500' 
  AND token = 't+KEK7k5w7Cnzb76aJ4yRlXdEsqGQUEIfXxokmPFjug=' 
  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"
    }
  }
}