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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4da2c9adcfc4e4f7bda08a77db24d605f681ef726768bbf82d3e98fa7e639a' 
  AND token = 'hChP8veZbDUkbgvs74RrT84jK4hMQ58+If7yBpIxTw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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