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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39ea2898736f9651a0595d2b239b123673b8b8482f8afd90dd5f3ae4c6a9b56' 
  AND token = 'TJHUu73XinEE1OZV7afdKOUmtta4vDl8ni05nuUnlSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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