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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dbe6aac544e17f87b6ad4e4f7237a925163b90e869c8c19311ca4492c7f606' 
  AND token = 'Fv/xsuWceTcSmZy5veJe7f1mxHqgGmAU/Y6Ywz1MIlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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