SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546d06d9ef5ad0b19e8c285d585e27d55e8153a4dde0cc1f6383f7e33aa7486b' 
  AND token = 'TEYsVLB0lhslVuq+I2VGKBxlFMJIdGjRC7aKcsKnQi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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