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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a37029898bdbcf85ce8a84a78761ae43384cfcf3bebb59544f13b5c586740c5' 
  AND token = '987EkHHgOXX7vCeq7Mq20NiLaRNLNjA22HavVQov9gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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