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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd305b2791d669afaf2b780276efd6182fd6c49e241abf9f08bb8c1c707a85106' 
  AND token = '4LXhUOxK7jbgLzbLA8vm2jcwXFMuf9OGtuQQt2iib60=' 
  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"
    }
  }
}