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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26f0e982e57104c926c4c72f5ce56d8350ed05136e027d71e22552e6ae07c5b' 
  AND token = 'abkDGKrxj1UjT08F7JpCzj74/eQcU/v8ROE0E7k4vZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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