SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f349d9c1d266af3d5972ded7b678a353868bafbda55f96928ea69c1d12b1830' 
  AND token = 'nSin1CQqIzr8mVAEQc0hV+yILRCy+VtzC7l+rBZ4J7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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