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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f4af7c623f4e6f59981f2b1f893e90e84f48d9d734f29c1ddd687510907e13' 
  AND token = 'TsMiABjaO5zGYv3vQZQSeoUcQoVCWV6QZzmsGEa9bS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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