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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e525ece11faddf6776c3c6548866126f88dc6896ab9b4ff5fb8e9f91fe3de7b' 
  AND token = 'F4al8Acz/TPLuzt9wtljH0LWBs6uhT8UhbS6mwff1S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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