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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589bc68fd5819003c79002288e9e58247f27b742e5afa9e6b9474153b5436b7b' 
  AND token = 'wty347QLY/B1ChmesLKO6qniyhtq8T+3kt10FadwEfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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