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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd2244373f893d85a32d310806f87dc24d2337bf3ac9cb3f941851bdf8f7c38' 
  AND token = 'K3u6kDgRsUgYzl6rXzeKtbt042MYfnhsueCogHMJJOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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