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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c79ca95353154df03adb6e6895cdb404b9d440f8be50ad0fa140f4bf3d5336' 
  AND token = 'rFeeXedk16w1jIiSpN/h+c3B2tofrVsX4LpH9K9ZQ6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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