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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954c3055e42ffad10506b35017db00d57a8b569faee22088ab6ce8fcbea9d3e2' 
  AND token = 'VAfMy+E0cOS0LYt6lWnzkbpOJA9xm84xOHR9jh5rBuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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