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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86163d80c2769bcf783a7eec82de5bd44816ca942e71444fd6f040857926dd72' 
  AND token = 'MewnnHyOO3CRWq0iFQy9FyDK87QXIPtnq5iQUVk1hmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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