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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b382073665e2df9cf590f6161bc6c1285c11d2decb47105649c179423bfca2b' 
  AND token = '9/vUkkUxP9qEFetbaR9l3K5rL99GZu8NXjjlRG1xFkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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