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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfbbbfad76d407b1bdbb4c80a32057152e3c605b1e7da5e05f0d07caaf3b189' 
  AND token = '617F3MVeabuoJKECjhJPaBWzL0f939VJ1x57oRQBhWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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