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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d2946e6113613c1f483206f6593e99245be77201f11ea4bbedd1af9bc10069' 
  AND token = 'itX+SE8nyVwoSF3ke4rg5qoWaZWScP3lEzM6yFnVv2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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