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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de7ed192195dbb091d20b85493caace0ee6b58a80d308294f5f9bae52d7d784' 
  AND token = 'gM++LotRfwzaEv5DDPfTMwyXJptxiCCTwwyep1v8HGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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