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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daadd07f5f0fb93487f808c10b4000d5d41451ff1c120236e5f6f8510858f606' 
  AND token = '+9AURBXijWSLtZaSmAsZrgk9dZicOs4GBiZMqK1bd9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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