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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e8015c5404e080fa1b28ee5a7cd72bd516c85804f3a042aacf7fb9fa48c6f4' 
  AND token = 'N4adflz9WUb8efm1SZMa2PlmBriDPClGlwxptz2gsz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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