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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd013f88e58375e35950455a94fdc8f37ace66bfac3d837c0a3452249bca8cf' 
  AND token = 'tkaeAvBk+1oMWgu4Q/8Oo64sH9FNIapaZhtaIcauTRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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